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Vulnerability record · CVE-2026-56215 · published 20 June 2026

CVE-2026-56215: Insecure direct object reference vulnerability

Capgo before 12.128.12 allows authenticated users to modify their mutable public.users.email to arbitrary addresses, which the SSO provisioning endpoint trusts as an account-merge key. Attackers can pre-position their account with a victim's corporate SSO email, causing the provision-user endpoint to merge the victim's SSO identity into the attacker-controlled account.

8.7 CVSS 4.0 High EPSS 0.39% · top 69.7% CWE-639 · Insecure direct object reference Deferred
8.7CVSS 4.0 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Jun 2026Last modified by NVD

Description

Capgo before 12.128.12 allows authenticated users to modify their mutable public.users.email to arbitrary addresses, which the SSO provisioning endpoint trusts as an account-merge key. Attackers can pre-position their account with a victim's corporate SSO email, causing the provision-user endpoint to merge the victim's SSO identity into the attacker-controlled account.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww
https://www.vulncheck.com/advisories/capgo-account-merge-via-poisoned-public-users-email-in-sso-provisioning
https://github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.4CVE-2026-55255Langflow IDOR in responses endpoint allows cross-user flow executionLangflow before 1.9.1 has an insecure direct object reference in the /api/v1/responses endpoint. An authenticated attacker can supply another user's …KEVEPSS 0.89%analysed

Source: NIST National Vulnerability Database (record CVE-2026-56215), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.